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Mariana went on a trip around the world. First, she spent 12 days in Europe and 31 days in Asia. Then she went to Australia for 55 days. How long was Mariana's trip?

days 
Second-grade skills Show expanded view
Counting and number patterns
Comparing and ordering
Names of numbers
Patterns
Addition - one digit
Subtraction - one digit
Addition - two digits
Subtraction - two digits
Addition - three digits
Subtraction - three digits
Properties
Mixed operations
Place values
Estimation and rounding
Logical reasoning
Money
Time
Data and graphs
Measurement
Geometry
Fractions
Probability and statistics
Multiplication
Division